How to control a short "animation" with a single bone?
Blend file
I took your blend, made a copy of the landing gear and rig and deleted the animation.
I then added Transformation Bone constraints to four of your bones; arm1, arm1.001, pad, and pad_backflip. Notice the different values of the Min and Max for the Source Z axis on the Transformation constraints. That is how I timed the different parts to happen at different times. Your Control_bone drives all of the Transformation constraints.